Answer:Pizza Problem SolutionsAssuming a recipe that makes two 12-inch pizzas using 1½ cups of warm water, 2 tablespoons (6 teaspoons) of olive oil, 1 teaspoon of sugar, and 2 teaspoons of salt: A standard 12-inch pizza is cut into 8 slices.To bake 2 pieces of 12-inch pizza, 1½ cups of warm water are needed.For 5 pizzas, 15 teaspoons of olive oil are needed.$$(\frac{6\: \text{tsp}}{2\: \text{pizzas}}) \times 5\: \text{pizzas} = 15\: \text{tsp}$$For 1½ pizzas, 0.75 teaspoons of sugar are needed.$$(\frac{1\: \text{tsp}}{2\: \text{pizzas}}) \times 1.5\: \text{pizzas} = 0.75\: \text{tsp}$$With 1.5 teaspoons of salt, 6 pieces of pizza can be made.$$(\frac{2\: \text{pizzas}}{2\: \text{tsp}}) \times 1.5\: \text{tsp} = 1.5\: \text{pizzas}$$$$1.5\: \text{pizzas} \times 8\: \text{slices per pizza} = 12\: \text{slices}$$ Operations on Rational NumbersStep 1: Solve for (18)(25)The product of 18 and 25 is:$$18 \times 25 = 450$$Step 2: Solve for (4.2)(2.8)The product of 4.2 and 2.8 is:$$4.2 \times 2.8 = 11.76$$Step 3: Solve for (1/2)(25)The product of 1/2 and 25 is:$$\frac{1}{2} \times 25 = 12.5$$Step 4: Solve for 19(34)(0.5)Assuming the problem is 19(34) \times (0.5), the product is:$$19 \times 34 \times 0.5 = 323$$Step 5: Solve for 5/9(3/4)Assuming the problem is (5/9) \times (3/4), the product is:$$\frac{5}{9} \times \frac{3}{4} = \frac{15}{36} = \frac{5}{12} \approx 0.417$$ Answer:(18)(25) = 450(4.2)(2.8) = 11.76(1/2)(25) = 12.519(34)=(0.5) = 3235/9(3/4) = 5/12